Attachment for cleaning air filters

Abstract

Attachment for cleaning air filters, comprehensive: - a fixed part of the attachment, which is designed in the form of a connector, - a closed rolling bearing with inner and outer rings, wherein one end of the connecting piece is rigidly connected to the inner ring of the rolling bearing, - a rotor which is rotatably mounted on the outer ring of the rolling bearing in relation to the fixed part of the attachment, - a screw cap, wherein the rotor has a hollow housing comprising an upper and a lower housing surface as well as a side surface connecting the upper and lower housing surfaces, The side surface of the housing has at least two openings whose axes of symmetry are perpendicular to each other and are located in the plane of rotor rotation, with a receiving opening being provided in the middle of the upper housing surface; the outer ring of the rolling bearing engages in the receiving opening of the rotor housing and is then fixed by the screw cap.

Description

[0001] The utility model relates to devices for cleaning air filters by means of compressed air that is sprayed onto the inner surface of the filter.

[0002] Devices for cleaning cylindrical air filters are known [https: / / www.airfilterblaster.com / ]. The rotor is designed as a bushing on plain bearings with four air supply pipes inside the filter.

[0003] Devices for cleaning cylindrical air filters are known [https: / / www.airfilterblaster.com]. The rotor is designed as a bushing on a sliding bearing with three air supply pipes inside the filter.

[0004] The disadvantages of the known devices are the pressure loss of the working air jet through the sliding bearing, the pressure loss at the outlet of the pipes due to the overall larger cross-section of the pipe openings, and the reduction in efficiency because the pipes are not aligned exactly perpendicular to the lamellae of the cylindrical filter.

[0005] The technical result of the applied-for utility model consists of improving the cleaning quality by reducing air losses via the rotating seal, facilitating the start of rotation and increasing the rotational momentum with lower air volume consumption for rotation.

[0006] The technical result is achieved by the design of the attachment for cleaning air filters according to point 1 of the utility model claim.

[0007] The attachment for cleaning air filters comprises a fixed part of the attachment, a closed roller bearing with inner and outer ring, a rotor and a threaded cover.

[0008] The fixed part of the attachment is designed as a connecting piece, one end of which is firmly connected to the inner ring of the rolling bearing.

[0009] The rotor of the attachment consists of a hollow rotor housing and is rotatably mounted on the outer ring of the rolling bearing relative to the fixed attachment part. The rotor housing comprises an upper and a lower surface, as well as a side surface that connects the upper and lower surfaces of the rotor housing. At least two openings are provided in the side surface of the rotor housing, the axes of symmetry of which extend perpendicular to each other and are arranged in the rotor's plane of rotation. A receiving opening is provided in the center of the upper surface of the rotor housing.

[0010] The rolling bearing enters the receiving opening of the rotor housing with its outer ring, whereby the rolling bearing, which is connected to the connecting piece, is fixed in the rotor housing by the threaded cover. In Fig. Figure 1 shows the attachment for cleaning air filters in its disassembled state. In Fig.Figure 2 shows the requested attachment in cross-section with the inlet opening of the connector and the outlet openings, as well as the diagram of the distribution of the compressed air flows.

[0011] The air filter cleaning attachment consists of the threaded cover 1, the air supply connection 2, the roller bearing 3, and the rotor. The rotor encloses the housing 4 for cleaning air filters.

[0012] The rotor housing 4 is a rhombus-shaped body with an internal cavity and comprises the upper and lower surfaces of the rotor housing as well as a lateral surface that connects the upper and lower surfaces of the rotor housing. The upper and lower surfaces of the rotor housing are arranged parallel to the plane of rotor rotation. Accordingly, the axis of rotation of the rotor is perpendicular to the plane of rotor rotation.

[0013] The side surface of the rotor housing 4 features outlet openings 5 ​​and 6 for the compressed air flows – the thrust opening 5 and the working opening 6. The axes of symmetry of outlet openings 5 ​​and 6 lie in the plane of rotor rotation and are perpendicular to each other. The axis of outlet opening 6 is radial to the rotor's axis of rotation in the plane of rotor rotation, while the axis of outlet opening 5 is perpendicular to the axis of outlet opening 6. Thus, outlet opening 5 functions as the thrust opening, causing the rotational movement of the rotor of the attachment, while outlet opening 6 constitutes the working opening of the attachment.

[0014] In the middle of the upper surface of the housing 4 of the rotor a receiving opening is provided, the axis of which coincides with the axis of rotation of the rotor.

[0015] The body 4 is attached to the connecting piece 2 with the rolling bearing 3 by means of the threaded cap 1. The rotor housing 4 can be manufactured in different shapes and sizes.

[0016] The connector 2 is hollow to allow air to flow into the rotor. The inner ring of the rolling bearing 3 is fixed to one end of the connector 2. The other end of the connector has an inlet opening designed for a threaded connection to an air supply pipe. Furthermore, the outer surface of the connector can be provided with grooves 7 for a wrench to secure the connector's position during the installation of the attachment.

[0017] All parts of the attachment for cleaning air filters, with the exception of the roller bearing, can be manufactured from various plastics by injection molding or 3D printing, as well as from light metals, such as aluminum, by milling.

[0018] The requested essay works as follows: Connector 2 is connected to an air supply pipe of the required length from the filter cleaning device via a threaded connection. A washer of the required diameter is then placed on the pipe to prevent contact between the rotating parts and the inner surface of the filter element (not shown in the illustrations). A compressed air supply hose is connected to the air supply pipe via a valve on the filter cleaning device. The air filter cleaning attachment is then lowered into the air filter until it reaches the bottom, the valve is opened, and compressed air is supplied. The operator cleans the air filter using up-and-down movements along its inner surface.

[0019] When air is supplied to the rotor, it flows through the connecting piece 2, with the enclosed rolling bearing 3 mounted on it, into the rotor housing 4. The enclosed rolling bearing 3 enables the rotor to rotate and reduces air losses through the rotating seal. The air then flows from the rotor housing 4 through two outlet openings: the outlet opening 5 of the thrust mechanism, where the momentum vector of the airflow is directed perpendicular to the rotor's axis of rotation and tangential to the lateral surface of the rotor housing 4; and the working outlet opening 6, where the air jet is directed radially from the rotor's axis of rotation in the plane of rotation. This results in a reactive rotational movement of the rotor, with the airflow from the working outlet opening 6 directed perpendicularly onto the inner surface of the filter material of the cylindrical air filter.As the airflow from the outlet opening 6 passes through the filter material, it removes particles from the outside of the filter element.

[0020] The efficiency of the air filter cleaning depends on the velocity of the exiting airflow. To achieve maximum cleaning effect, the outlet openings 5 ​​and 6 on the rotor's side surface can be positioned as far away as possible from the rotor's axis of rotation. In this case, the points on the rotor housing's side surface are located at opposite ends of the surface relative to the rotor's axis of rotation. This results in maximum torque for a given incoming airflow and, consequently, maximum rotor speed, which in turn increases the velocity of the airflow through the working outlet opening 6.

[0021] As part of the development of the applied-for utility model, comparative tests were carried out on the applied-for attachment for cleaning air filters and the industrial rotor Air Filter Blaster, known from https: / / www.airfilterblaster.com / . Comparative test, example 1. Determination of the exit velocity.

[0022] The test was conducted with a stable supply of compressed air at a pressure of 8 atm to the requested attachment and to the rotor of the Air Filter Blaster. During these tests, comparative measurements of the airflow velocity were taken using an anemometer.

[0023] The anemometer, used as a measuring instrument, was positioned at a distance of 100 mm from the proposed mounting device and the industrial rotor. The measurement data are shown in Table 1. Table 1. Measurement of air pressure velocity, m / s Measurement number Cleaning device for cylindrical air filters Air Filter Blaster Requested rotor for cleaning air filters 1 3,9 5,2 2 4,1 5,2 3 3,9 5 4 4 5,1 5 4,1 5,2 6 3,9 5,1 7 4,1 5,1 8 4 5,2 9 3,9 5,1 10 3,9 5,2 Comparative test, example 2. Determination of residual dust in the filter.

[0024] A dust collection system was used for the test under stationary conditions. The system comprised a dust collection hopper, an air duct system, a filter housing, and three air fans, each with a power output of 1.5 kW. An airflow with a volumetric flow rate of 0.6 m³ / h was generated. 3 ·m / s ensured.

[0025] The device with the industrial rotor from Air Filter Blaster (Device 1) and the device with the requested air filter cleaning attachment (Device 2) were used to clean the air filters. The following materials were used in this comparative test: - Technical talc - 20 kg; - Filters of one brand, uniform, 20 pieces;

[0026] The comparative test for each of the tested devices included the following steps: 1) Determining the weight of the clean filter before the test; 2) Installation of the filter in the dust collection system; 3) Uniform supply of talc at a volume of 100 g / min to the dust system during operation; 4) Determination of the weight of the dusty filter after removal from the dust collection system; 5) Cleaning the dusty filter for a period of 1 minute using device 1 or device 2, as appropriate; 6) Determination of the weight of the cleaned filter.

[0027] The comparative test was carried out over 10 cycles each for devices 1 and 2 for filter cleaning.

[0028] The results of the comparative test are shown in Table 2 for device 1 (Rotor Air Filter Blaster) and in Table 3 for device 2 (application for air filter cleaning attachment). Table 2. Weight of the remaining dust after cleaning with the Air Filter Blaster cylindrical air filter cleaning device (Device 1) Measurement number Filter according to dust load, weight, g. Filters according to dust load, weight, g. Filter after cleaning, weight, g. Residual dust, g. 1 1700 2525 1830 130 2 1700 2480 1820 120 3 1720 2510 1830 110 4 1710 2490 1850 140 5 1720 2535 1870 150 6 1700 2510 1860 160 7 1710 2520 1830 120 8 1720 2490 1860 140 9 1700 2520 1830 130 10 1710 2530 1860 150 In total 1350 Table 3. Weight of the remaining dust after cleaning with the cleaning device (device 2) Measurement number Filters according to dust load, weight, g. Filters according to dust load, weight, g. Filter after cleaning, weight, g. Residual dust, g. 1 1710 2520 1800 90 2 1700 2480 1780 80 3 1710 2520 1780 70 4 1710 2490 1780 70 5 1720 2520 1800 80 6 1700 2510 1780 80 7 1700 2520 1760 60 8 1720 2490 1790 70 9 1700 2520 1760 60 10 1710 2490 1780 70 In total 730

[0029] Following 10 tests of device 1 (Air Filter Blaster), the total weight of the remaining dust particles was 1350 g. Following 10 tests of device 2 (application for air filter cleaning attachment), the total weight of the remaining dust particles was 730 g.

[0030] The data obtained during the tests demonstrate an improvement in cleaning quality through a reduction of residual dust by a factor of two compared to known solutions. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature

[0000] https: / / www.airfilterblaster.com /

[0002] https: / / www.airfilterblaster.com

[0003] Filter Blaster performed, as seen at https: / / www.airfilterblaster.com /

[0021]

Claims

[1] Article on cleaning air filters, comprising: - a fixed part of the attachment, which is designed in the form of a connector, - a closed rolling bearing with inner and outer rings, wherein one end of the connecting piece is rigidly connected to the inner ring of the rolling bearing, - a rotor which is rotatably mounted on the outer ring of the rolling bearing in relation to the fixed part of the attachment, - a screw cap, wherein the rotor has a hollow housing comprising an upper and a lower housing surface as well as a side surface connecting the upper and lower housing surfaces, The side surface of the housing has at least two openings whose axes of symmetry are perpendicular to each other and are located in the plane of rotor rotation, with a receiving opening being provided in the middle of the upper housing surface; the outer ring of the rolling bearing engages in the receiving opening of the rotor housing and is then fixed by the screw cap.

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